Let me preface this with I haven't personally tried using a lightweight bar to mill. I would not use such an expensive bar for milling. There will be a LOT more heat build up while milling and with the reduced mass of the bar, I would assume that it would be harder to dissipate before reaching some limiting/damaging temperature. Also there is a lot more wear on bars used for milling. I would rather use a less expensive bar for milling that will take the wear without me worrying about the dollars I will be filing off at the end of the season when re-truing the grooves. I would just deal with the extra weight. The mill will already be rather heavy with the frame and aux oiler, so what's another pound? Also, I don't mind a little extra weight on the business end of the mill. It makes it a little easier to balance when cutting the first cut on rails and when cutting more narrow logs. Hope this helps!
